I would guess that Apple would upgrade to the new chips immediately. If Apple doesn't use them, then other computer makers most definitely will. They are the new intel chips... Do you honestly think Apple will let it's computers fall behind while Dell adopts a faster chip? Apple has always been cutting edge.
In this new world of intel chips, where new ones come out more rapidly, Apple has to be prepared to make the changes. We're just used to waiting several years between chip upgrades... this is a whole new ballgame, and I'm sure Apple is ready to play ball.
As for giving them to the macbook, maybe only the black one... The MBPs will get them right away.
Of course I don't know for sure on any of this, but it's fun to guess!